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sgemqr.f(3) | LAPACK | sgemqr.f(3) |
NAME¶
sgemqr.f -SYNOPSIS¶
Functions/Subroutines¶
subroutine sgemqr (SIDE, TRANS, M, N, K, A, LDA, T, TSIZE, C, LDC, WORK, LWORK, INFO)
Function/Subroutine Documentation¶
subroutine sgemqr (characterSIDE, characterTRANS, integerM, integerN, integerK, real, dimension( lda, * )A, integerLDA, real, dimension( * )T, integerTSIZE, real, dimension( ldc, * )C, integerLDC, real, dimension( * )WORK, integerLWORK, integerINFO)¶
Purpose:SIDE
Author:
SIDE is CHARACTER*1 = 'L': apply Q or Q**T from the Left; = 'R': apply Q or Q**T from the Right.TRANS
TRANS is CHARACTER*1 = 'N': No transpose, apply Q; = 'T': Transpose, apply Q**T.M
M is INTEGER The number of rows of the matrix A. M >=0.N
N is INTEGER The number of columns of the matrix C. N >= 0.K
K is INTEGER The number of elementary reflectors whose product defines the matrix Q. If SIDE = 'L', M >= K >= 0; if SIDE = 'R', N >= K >= 0.A
A is REAL array, dimension (LDA,K) Part of the data structure to represent Q as returned by SGEQR.LDA
LDA is INTEGER The leading dimension of the array A. If SIDE = 'L', LDA >= max(1,M); if SIDE = 'R', LDA >= max(1,N).T
T is REAL array, dimension (MAX(5,TSIZE)). Part of the data structure to represent Q as returned by SGEQR.TSIZE
TSIZE is INTEGER The dimension of the array T. TSIZE >= 5.C
C is REAL array, dimension (LDC,N) On entry, the M-by-N matrix C. On exit, C is overwritten by Q*C or Q**T*C or C*Q**T or C*Q.LDC
LDC is INTEGER The leading dimension of the array C. LDC >= max(1,M).WORK
(workspace) REAL array, dimension (MAX(1,LWORK))LWORK
LWORK is INTEGER The dimension of the array WORK. If LWORK = -1, then a workspace query is assumed. The routine only calculates the size of the WORK array, returns this value as WORK(1), and no error message related to WORK is issued by XERBLA.INFO
INFO is INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Further Details
Author¶
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